Composite board



Jan. 20, 1931. H. H. VAN HAGAN l l 1,789,327

COMPOSITE BOARD Filed Jan. 28, 1927 v 'Lf' A1 j fida Z -vwautoz A HOHER H VAN HAGANl @Moz/n i' Patented Jan. `20, 1931 UNITED STATES HOMER HERBERT VAN HAGAN, OF BUFFALO, NEW YORK, ASSIGNOR, BY MESNE AS- SIGNMENTS, -TO CERTAIN-TEF@ PRODUCTS CORPORATION, A CORPORATION OF COMPOSITE BOARD Application md January 2s, 1927. serial No. 164,273.

This invention relates to composite boards and aims to provide a novel and improved board of the type which is characterized by its superior durability.

5 The nature of the invention may be readily understood by reference to one illustrative embodiment thereof shown in the accompanying drawing in which Fig. 1 is a fragmentary view, partly i`n sec- 1 tion, showing a means for applying toughening material adjacent the margins of composite boards.

Fig. 2 is a right hand side view of Fig. 1. The illustrative composite boardis typified herein by a plasterboard comprising a body of plaster or the like having covering 'material of paper adhering to the faces thereof, and adhesively reenforcing the plaster body from edge to edge. The margins .of one or both cover sheets may be manipulated vin such a way as to cover also the side edges of the plaster body. In the present board, the margins of the bottom sheet are folded over the edges of the plaster body and adhere thereto.

A board of this character may advantageously be made by what is known as the continuous process, namely a process wherein a quantity of plaster is deposited upon a continuously travelling cover sheet (in this instance the bottom cover sheet) and thereafter uniformly spread over the sheet to 'uniform depth, the top cover vsheet being preferably simultaneously applied during the spreading process. During the process of forming the boa-rd, the margins of'fathe cover sheet are advantageously manipulated tocover the edge of the board.

The board is thus made in .a continuous strip or sheet which is cut into suitable lengths as soon as the plaster has become sufiiciently hard or set to permit the board to be handled.

'After the boards have been cut to length, they are generallydried to remove excess moisture.

During the stage of manufacture after the formation of the product, but before the board has been cut to length, the product is suitably treated to toughen it, adjacent its adjacent such side edges.

edges. In the present instance, the product is treated lto toughen it superficially -at its side edges and throughout a narrow re ion toughening may be conveniently effected by the application of glue or shellac or other material which will protect or toughen the paper against abrasion or peeling.

This super cial The board strip comprises a plaster body 1 contained between cover sheets 2 and 3 and which is fabricated and conveyed on endless conveyor 4. Margins 5 and 6 of sheet 2 are folded towards the other sheet to inclose or partially inclose the edges of the plaster body.

Means for applying the toughening material are represented by wicks 10 which drag along the side edges of the board and overlap as much of the surface of the board as it is desired to treat. The wicks may be suplied from a suitable source of supply typied by the receptacles 7 which are provided with conduits 8 that conduct the coating material to the Wicks. Valves 9 may advantageously be provided in the conduits to regulate the supply of coating material to the wicks. The :capillarity of the wicks serves to conduct the material to the product.

The vehicle used for carrying the coating substance depends upon the character of substance applied. If glue be used water will serve as a satisfactory vehicle.

By the foregoing describedl means'the continuous strip or sheet of board is treated as it passes from the forming mechanism to the point where it is severed into boards of proper length.

The toughening'of the edges of the board serves to prevent scuiing or scratching of the paper which occurs during the ordinary handling of the board and particularly where the product is slightly moist. In such condition the paper is particularly susceptible to scuffing and peeling. Even with the repeated handling to which the board is subjected before it is received by the retailer or material man, the board with the toughened edges always presents'ja neat appearance, thus promoting the saffof'the product. In the illustrative board, the bottom sheet of papergeneral'ly serves as the face side or sheet of the board, that is, the face which receives the wall paper or. other decoration. Generally in the handling of this type of board unusual care is takenfto preserve the 5 face side of the board froml any marring orany other damage, and it is,therefore, unnecessary to apply any of said coating material to this face of the board. It is suilicient to coat simply the edges. of the board, and, lo the region at the back oftheboard. adjacent the edges. With other boards; off this type the face sheet has' beenspecially treated in its manufacture to.- give a surface: which will readily receive paint or other decoration, but which will resist any penetra-tion; or absorption of paint into the body of." the paper. Paper so treated does not generally require the protective coating given the. edges of l the board. l Obviously the invention isy not' limited to the details of the illustrativey product and method above described, sincethese may be variously modified. Moreover, it is not indispensable that allrthe featuresI of the invention be used conjointly', since certainfeatures may be advantageously employed in various combinations.

Having described one embodiment of my invention, I claim:

i 1. A composite board comprising a body material and cover sheets for facing said body material, one of the sheets folded over the edges of the body material, and toughening material applied to the folded edges and along the margins of the other cover sheet.

2. A composite board comprising a body material and facing sheets, a strip integral with one of said sheets extending along the edges of the body material and a coating applied to the exterior surface of the strip to prevent peeling.

3. A composite board comprising .a body material and facing sheets, a fibrous strip integral with one of said sheets extending 5 along the edges of the body material, and

toughening material applied to the exterior surface of the fibrous strip. "4. A composite'f'board comprising a body material and facing sheets therefor, a fibrous 5o. strip integrally attached to one of said facing sheets and extending along the edges of the bodymaterial, and toughening material applied to the exposed surface of the strip to prevent peeling. 5. lA composite board comprising a body material and cover sheets therefor, the margins of at least one cover sheet being folded over the edges of the body material, and toughening material applied along the mar- '60 gins of the cover sheets.

In testimony whereof, I aiiix my signature.

HOMER HERBERT VAN HAGAN. 

